RFR: Merge upstream jdk-14+15

[Aleksey Shipilev]

On 9/19/19 4:20 PM, Roman Kennke wrote:
> Let's merge up to last tag from upstream jdk14 from today, jdk-14+15. It includes yesterday's sfx
> and arraycopy fixes, so required some easy merges around those, otherwise clean.
> 
> Testing: hotspot_gc_shenandoah
> 
> http://cr.openjdk.java.net/~rkennke/upstream-jdk14-merge-2019-09-19/changes.txt

OK, let's do it.

-- 
Thanks,
-Aleksey